Freight car loadings over an 18-week period at a busy port are as follows: Week Number Week Number Week Number 1 400 415 430 415 430 465 525 540 13 14 575 580 610 640 9 10 16 17 6.. 435 12 570 18 655 435 11 510 15 a. Determine a linear trend line for expected freight car loadings. (Round your intermediate calculations and final answers to 2 decimal places.) b. Use the above trend equation to predict expected loadings for Weeks 20 & 21.(Round your final answers to 2 decimal places.) ] and for week 21 is The forecasted demand for week 20 is [ r intends to install new equipment when the volume exceeds 980 loadings per week. Assuming the current trend rounded answers, as required, from continues, in which week (at the earliest) should the loading volume reach that level? (Use the any previous part of this problem. Do not round any other intermediate calc places.) ulations. Round your final answer to 2 decimal It should reach 980 loadings in Week